1. [v]  make crude or savage in behavior or speech; "his years in prison have barbarized the young man"
2. [v]  become crude or savage or barbaric in behavior or language

BARBARIZE is a 9 letter word that starts with B.

1. \Bar"ba*rize\, v. i. [imp. & p. p. {Barbarized}; p.
   pr. & vb. n. {Barbarizing}.]
   1. To become barbarous.
            The Roman empire was barbarizing rapidly from the
            time of Trajan.                       --De Quincey.
   2. To adopt a foreign or barbarous mode of speech.
            The ill habit . . . of wretched barbarizing against
            the Latin and Greek idiom, with their untutored
            Anglicisms.                           --Milton.
   

2. \Bar"ba*rize\, v. t. [Cf. F. barbariser, LL.
   barbarizare.]
   To make barbarous.
         The hideous changes which have barbarized France.
                                                  --Burke.